Marquis reagent — 3-HO-PCP
White · Brown · Purple
3-HO-PCP (Hydroxyphencyclidine)
Source text (English): faint brown / pink
There are more substances than colors, so to increase analysis precision use a kit with multiple reagents. Exact color of a reaction depends on adulteration, quantity, lighting, temperature, exposure to air, storage, as well as reagent quality and degradation. Positive or negative result does not indicate if a substance is safe. No substance is 100% safe.
3-ho-pcp · 3-HO-PCP (Hydroxyphencyclidine) · Hydroxyphencyclidine

White · Brown · Purple
3-HO-PCP (Hydroxyphencyclidine)
Source text (English): faint brown / pink
White · Purple
3-HO-PCP (Hydroxyphencyclidine)
Source text (English): light purple
Yellow · Green
3-HO-PCP (Hydroxyphencyclidine)
Source text (English): brown - green (?)
Colour swatches are illustrative, not measured colour values or reaction timing. Original reference observations are preserved below each result.